NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of the committee responsible for the report were chosen for their special competences and with regard for appropriate balance.

This study was supported by Contract No. DTFA03-99-C-00006 between the National Academy of Sciences and the Transportation Security Administration. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the agency that provided support for the project.

A limited number of copies of this report are available from the National Materials Advisory Board, 500 Fifth Street, N.W., Keck WS932, Washington, DC 20001; (202) 334-3505 or (202) 334-3718; Internet, http://www.nas.edu/nmab.

Additional copies of this report are available from the
National Academies Press,
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Copyright 2006 by the National Academy of Sciences. All rights reserved.

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